Move color-definition of build-state to global scope

[ehmkah]

Many different build-systems are supported and the state of the build is mapped to a color. This mapping is implemented in getBuildStatus. It would be nice to have a global defined mapping of states to color. It would make it

• easier to define which color could be expected especially if you show different build-systems simultaneously
• easier to define themes where the colors of build-state could be changed too (no idea whether thats useful)
• easier to integrate new build-systems because colors are already defined

e.g for such a mapping could be (taken from https://github.com/marcells/node-build-monitor/blob/master/app/services/Tfs.js)

 const colorScheme = Object.freeze({
    succeeded:          'Green',
    partiallySucceeded: '#F8A800',
    failed:             'Red',
    canceled:           'Gray',
    inProgress:         '#0078D7',
    completed:          'Green',
    cancelling:         '#0078D7',
    postponed:          'Gray',
    notStarted:         'Gray',
    all:                'Gray'
  });

[marcells]

Good idea. You can implement it, if you want to.